If I declare a variable within a block (see below) is there a way to specify that its visible outside the block if need be?

if(turbine_RPM > 0) {
    int intResult = [sensorNumber:1];
    NSNumber *result = [NSNumber numberWithInt:intResult];
}
return result;

or is the way just to declare outside the block scope?

NSNumber *result;
if(turbine_RPM > 0) {
    int intResult = [sensorNumber:1];
    result = [NSNumber numberWithInt:intResult];
}
return result;

many thanks

gary